<!DOCTYPE html>
<html lang="en">
<head>
    <style>
        html {
            display: none;
        }

        div {
            background-color: red;
            height: 200px;
            width: 300px;

            margin: 15px;
            border: 10px solid black;
        }
    </style>
</head>
<body>
<div></div>
<div></div>
<div></div>
this text doesn't matter because `html { display: none; }` should prevent it from being built into the box tree
</body>
</html>
